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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddffc8abf5c60fa16aff19a9268f4beaef1e29180f7e89ff5212d7f82d105f03' 
  AND token = 'd+8ajAw2BBuo3AtKsHsDV6zeECyY0+sufXCoWWAKtks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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