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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ce60cba39010685afe6aaa15260cb9086b4b016f972a0bfcf2bbbe9cee1c5c' 
  AND token = 'tjAc7TY3ICsKtDYJ31GFzwiM0CG4stoC3pc3d7LuSa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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