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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26a6fb6ee0be5643c9b1cc9868ef0ac8ff9955540a88e5f8c40758f7ff5bba3' 
  AND token = 'NIvMpQ4Sn5SvwDWffvgn78O7QJZRsGcesu00A0jW3Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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