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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931e148c00b9039b58a7e54887bb4b29c35f92544d81e14fa1aca30a3c87f60d' 
  AND token = 'D3Ey58pri451oua9hFXIY8Y/bIW+YS5dWsmkNj6mKII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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