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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c093db03dd38a539b32de1ae6071788063a361592e38c1fc87494a3702370a09' 
  AND token = 'oSJ7d1ipfOxUku9CizREDMkfDPDzf7IWoUziDiXM/NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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