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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d1fedc3d1c19aa27900d327c40ef30ed5084ed9f4db95ed32f4174ff6beb77' 
  AND token = 'oPoPau3Hfb+PQRcgPjfV3wI5ERi0MYkusHudoNdCX+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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