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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cceb0c9a1d7be0b737cca61cc809e9780a1c543c1afeceeb1cd2b03ce22ed80d' 
  AND token = 'Aac4f1snTUYgC0zardr44xS1wAwRsBn6RbOnnwFm7bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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