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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4559d2c814c3c30576c64ab72ae3ed3f0042633ebdc6fae185557ca7d9c06c' 
  AND token = 'BTfDoA8xd3C6ZCz532tcE1zwXq4z5KaBWzgS1U/iK8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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