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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb51268d84bb446980685b0df60d677db0c554d219a61a6c86d6c4bb5ab4416' 
  AND token = 'QRVu7kq2VXytgSgD7ZIGmCDUFvECTF0PRc+wE8yeA2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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