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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0986bcfb39771a2976c57dc7c8559a47f57fe9f8bc4e725aed6f59a88d098b85' 
  AND token = 'miFWOx8uEp9wejaYC1vyzWePYuX9ewPxf+teTG/QvQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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