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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d34452c33a011420ff7ee56feea84b3d2323903fb8749d910aed393ed3d4ac' 
  AND token = 'GdTFrU0d3iUDsIHl8NyrfoXH7wUxJWfaFpcnS0rc9xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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