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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd149ad085edf63955425b6b49fc2155b7578531b750afa592d339a3b346dfdb' 
  AND token = 'r0VeRPmgP5fju6XUceclPOdO/34KeyOnfYuejaVHWpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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