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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9adaf3c42a5165e269ffe0ee2edf3e299d2419cef3a8e48dbb699d625a945bf' 
  AND token = 'rbNf2TtktUu20FZEYQWVff5uWp/LMkTdBEwOICPsDD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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