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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96be68f3a4d7ed22b75c8c577efff28d748b20b74c498a2940a48c410f1556cf' 
  AND token = 'llfp0ofA/OHLps6tl1NQ8FctXLSgzpsEtcW2aX034tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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