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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5072a8534c4e11a4c78ddd4b9db258a8233891a8d66a59276c37ec47f605c103' 
  AND token = 'Ldhlp/rpFUqLCUkm80gwpGjc78OQB7h9asF9ynLlNJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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