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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499607e82f758ebfb0c6bedf339a7993de74b545004a7f50e726e927373fc93f' 
  AND token = 'DNz00Khs8eG5m7YXfYlO7A00wfsZtpzt8Zw0tKgvwPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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