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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19ab0f4f7cc4ccb35fee3e0da83712e08bb9e52a1116f85614f5553718f7bef' 
  AND token = 'eSRv+7gNzohm3/ANu0YC7S7tBlKMWX5NZ2Q3Wy/w5jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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