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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf4ec1466aa1a7360e20c2b6a2224c584358dea8870ba697b3da044f04c1511' 
  AND token = 'aWy2EIY7vb6sKJeCXbkWolGvqf+Z8/Nwq7/f2mk8wm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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