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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9b41f29bbec51d6946b5a3c990eccbe4f4012074b3a2d3e0b074c35d12ba5a' 
  AND token = 'mGdQ/ynm5lbUcgGqRQX4Ptu8htIdsYEa/tzP5ZRzmxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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