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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3695449a3b695fd1f06995a1f5247cb0433541e06441283efd7bb30b8ae57f' 
  AND token = 'DXqE5lAmlIagVUWXQR6VCnLrpQbVGM/9v+MrsDbvkf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01790

JSON explain

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