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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7414afd73980c7bc9cb6c55d90fff5dc0a97c476ba6bd0f6f72a6e1a4ba32d' 
  AND token = '80IPnu67ow2/gbqdr/PAVdvXMdBridFonu6kwgQtYT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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