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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4e42656e1f8e88a0902780bc49a5009e71f5c8005a858b996f0d8ded316974' 
  AND token = 'lmF1r2cevp9M0RRCtAcJ6RcW8LlduZz+kEhltJBays4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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