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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdfa6bed71e06c9af923b23e83682de96356b365425eca557e1381bb245aaab' 
  AND token = 'WyUFUqvD6u9Zj288ZNUdhd/Iy5GAr206MZo3lNvFBk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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