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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3235b77e05bcd33ea03259b0d02e56d413c3edf61566acc98e6eecc51c2b9d4' 
  AND token = '60WT/4ErSTzjDW+jw6N/p/vowYve0/GJ5fi3gXr/Qj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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