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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8c1f40b5d321a06e7d7c55216aad054573d0dbc73cc3834b73c37367def7e0' 
  AND token = 'HGZArH2/6YPQaXObErBeBosvO/nVT4BAFmyonHNUjvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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