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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0592cc245c88ae1a9644f10f58f4c3c145fa6f1daf668dce8d9a3ac235d5ece9' 
  AND token = 'QePehe9UjXxFu543xxCSu5ooTJduxtDjDJeO4lNXXzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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