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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185b32cc20c5f9d6026db0b4f2c665cd36d5bfef2e86dcdb60053681c5fccaee' 
  AND token = '5z+fpO+aAMjhVthTHXlaMKK6tXblrm0eYNBRpb9OmiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}