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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84eab9fe1202f880333a3d04fec12a5614039e2a7a4c7739890d09aa87c97a45' 
  AND token = '4Wgr8r5agTgOjRhtuOLc+oxuefy2ynhTSZz2T+/woBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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