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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987ce1708f2759a43cda4d9bb167247f2bf836fee03f706eab075a409ee370a7' 
  AND token = 'ca+/aUGuLNQb8wOvbX5YAbnxg3f5oe2iU5HEF054WbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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