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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b580eaf2153daa3caaa851f8e6f3d8e11d0bb6ef18e2cdf590dd49639a4ff0a6' 
  AND token = 'bzfgGdtXzJwPi+ShVnj0RfAOr6s3Dk6dEM3pmxUMXhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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