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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f51ee5e46c204cc4f4a239c12bcdfc0c3a936e1df301c09737282275c39d929' 
  AND token = 'Et1gjqx3buwf6H2takZEw7BZmJJ5xYX6+qAjx4RY4wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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