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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f6796bacb71242c12d952d274ad6f75699be6c772cfb22e10b5ccf669269f6' 
  AND token = '6jKkg6GYbKDD2saH5UVvgf7qPwFuFastdwq+FBIA4Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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