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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b14559977acb674ffbc573759eb7a539dabdf60d38d8d2e7d9150f581dbc2b5' 
  AND token = 'CdQZ0PcBYSAGIVLoNSXwnOyE+eGP/ODKY4TDfAQ5/XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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