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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca72c666ad660d7868d10d63c965548e74379f11cc1de7bc376a4cd3a95b30e' 
  AND token = 'do3xenVv603Mr3/DqgCHOggQviJ+zk4AVGmLNF7LIqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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