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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec98ef5355addc78baa9db3892e1be29b497bdccf4da5d5644ac05db4faf43df' 
  AND token = 'Uf+axfqN033F5bnmFuvTlrFNXV1+Q6ywDMzPA1QKHLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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