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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3fa9b293cbfbbef25386377ecc65080ebe6f44bd12a86d4afe7303cb0a3cb8' 
  AND token = '86XfadhK6OOIxzXg2TpQI+xoJ4YMbuUl7g2q0P6Eqes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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