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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39455df8f1d89667bcce479b8cbd4a61006e847b1ba7d3413d840900154e8640' 
  AND token = 'ixCm7idaNQu/ZXf87y5VdYuk1c+ma+K1arfhBAhAUdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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