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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cc2a574bde9711cbacda681922bfe947dc30101de60f66d8da8f63293817e5' 
  AND token = 'qIsEjLK0eEMdTC4TeF/eHU49Zz22rxbb+UJdDCJkIoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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