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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb3bfc9fc507bffbc775034cd46ef71aab3c8b8d1e517b57d7a36ae67b267fe' 
  AND token = 'XWq9s11MlMtRiZN0uyvWESWPPWEUz7L1E5xly8b5Kis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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