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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517701a5852dc2b4ad79629a5a002555ac143209728e92cf25d6e89f8c1f1294' 
  AND token = 'AD5RRHlMkZwJzulHkuM4yQFZ7CMuZ1cOTszRCyvH2Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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