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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9909c75177262fcf1b0bbd046ef0ab230fc45095792a6e41c334b4ec6ea139' 
  AND token = 'IFFq8+CUdUkaPv9Ll4HCYErv2+Y8fms6BpluMdUh62w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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