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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9a3353bc13f8393ea2ddca865de51fa91ee09cf74e9759d95e93de30d88f36' 
  AND token = 'czw997HBFdpyWUCGLyW3L7zLhZrEMqblP6S9FBFT9yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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