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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05982f987805725c069ee6f28c029e2039743bce23d7509e132ee3f0f0dbab25' 
  AND token = 'giQ67tC5la9N/8Qzy31pf2NBZVQV+X6iGUFfLGrlPGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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