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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67eaf2b73a9b49fb2f8a44672e64126d0cc0789ff094721052baca467adc9f4c' 
  AND token = 'wXJ+ZOrpbzrmqzsil+7s7dh4bX1CCofhn/D21Na45DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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