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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e147e2374c162dd87db61c4c0f0298e8b7170fb639272075cdb34a2c3ae34a' 
  AND token = 'jiUxo2JcjZ3IG54YTvsuuBZ1wOYydSoo2DGMxtiq8bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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