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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef20317be5a7a2d3a072c156153bd694aa523e6a35f89f62b30bf384f18ecda3' 
  AND token = 'XvU74b5alxgobLSGJlJL7DbEDAj6Rj7xR2SjeKrj+uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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