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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab8f4de7ab98170fdbbea2b90d625905be9d4824c0d905e7639fe907daa17f0' 
  AND token = '9+G6Jr7LpESNdnKLHSycc3kediNgawKPGVwEk1vqKDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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