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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92560b803a6bcfd4d1d300b655dce45b5817f457eaebf69338739f33eb92ea90' 
  AND token = 'P9J7V//ZZBZZ5RT9BXRwdcI3ol48fSLa/aDYi5dcLYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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