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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8682e639d81162b82e8b18f569a56cb0ff65da33fb77dcb3cda096caa43127be' 
  AND token = 'mtQ6ubwAlRRc+0RAE2y2DLxrHLo2L0W/r9baqBlr/Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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