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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065aec4d79e356bb1911b27bddfcee09bc05dbb7501259466143483d1bf0b257' 
  AND token = 'NfIAWzcEtu0aZu/+L4erzQ/UJDYNbTc1QEHHmw7UE1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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