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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddbc6727ba79fdb8b465df5aa054c5aa6d7d8c75a9a6295685a855134c38a35' 
  AND token = 'H71x4tr2hR0tUOtB1nI3Pwg4Aqe8QNOc5NK9ethTZm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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