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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0125f10a1763ba7898e215491455583525dd9ab09b44942d431179d4f59f132d' 
  AND token = 'J2/Tuecl7Soo67euLfuCCJchXPuyuvrP84pReBS/8Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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