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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31da36ba47e38c13c790f6288d51b5c20786118c2f4c27485b5e7a4e52ff7a98' 
  AND token = 'lmQUejuD911CCKb6fpejcMlC1iAr2j37YZYOj4xlgs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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