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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e532dd2767ab6f8d2ef40f75315d5d5f6ffdcf01daeea9bf17d584d9720356' 
  AND token = 'p5suDKUH1mZMk4lqpyWQsmTMvOVO9RWQRMlIBoiWzkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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