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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7732eabc956fe0dbc22f32a7ba997e59723b9fb93b542ef43f1a2255a3b1853e' 
  AND token = '9P4m9vsTp58OMhH7CXUikGwCStl5wLvf/T0zVbRvrnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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