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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752b3aca5a2a60cc4b0b56874c33e48d988d8027522d235346ef64595670b8e7' 
  AND token = 'MHxJVaU3CyTXa2N/Ve4k8Pg5qgzIHAvzSYvquIP1REg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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