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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2ce3575968b618d482ed3953c7e6cc9b6ae6a12e953aa0092daf4a0154f702' 
  AND token = 'sJ2CnO+8CDwk/O09wOTJzocrUoHLuqd76LhmChTB7wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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