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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd992796b9286128773518cf0d5c2367d9957d6b807912bf875127026b54b7f57' 
  AND token = 'NxD6GHSQ0nDD+hhkh1RcAh8w7AN0YxwRPfNKkQfPCR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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