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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac78fbde2724a0b6be1dfaeedc1b62934bc170fb1c50a3890020479437e2f23a' 
  AND token = 'suF42FfLHQWUsOj0eatrz0W9X8L/cjAo92B/P8vzdYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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