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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb1f3898e0e136d9d3e866e08f404321bf318668bfba9810de02b5daa850a24' 
  AND token = '/I2DxQcE11SFucsNv17Mj9Lg+BtvRKr9+5vYClqcki4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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