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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94645866f6c34db1a6aa0e556903b9d541b2baa9083f580b6f842d8aed51841' 
  AND token = 'dCN+zPUuryx3E3aF1nFW+auYJ0bKz22ZGcd5tfVxGwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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