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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883d2e64b33b8a2e7b99f6f0cd5ff4d95c5b196f5659bd9c382921919eaf285b' 
  AND token = 'KKoetNs7v89iH6X8ICefaec1xNoOn4SSzCo7utP5WNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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