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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13d3cfb35f4a86dd6deba2bf2e3fc2bdb97d972b4b5ce8e475eb0fe6dc5589b' 
  AND token = '4vkxdRFeJpphxqHOA7R8Xk5z3Tzc6tDZHq2gha6/Sg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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