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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e48247ee8eccc84ec8c4530b12004320f046dc3c90cd3c1a14229f250c71c86' 
  AND token = 'LFlGwmSlzNj25Sg7TB8sVT4w9fe5Hr6prYU6VEPfE/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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