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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428f17fe775fa8bfeaa59ec40dc55fa9fd5d4fbe75b19775ea886b6b037a797e' 
  AND token = 'm78LTK7gL/j3hPfQNWzakMyMzvLcKanfQJdErzAEkK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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