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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7db86d1d7a13413e18cc9e0d9eceafb7026941656fdb435696f1df9b83eb7da' 
  AND token = 'awlSwJBONcPgMaumior7Bm0d+mPnl6p7Vdc89LXJ5a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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