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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5409b93ec66476379ed64f424e32a12cc955e945a82a532b676573acd8e09f4b' 
  AND token = 'qdIzFTQzpd9rl8p7fXq0AcN3cfwDfJJ9dJ5zQp9wHzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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