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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f493cd8d067068d8a9e38b4e15cedd080179c1620bc1821977972941d02694' 
  AND token = 'gdw/ipBDblOazDOTWO45m6G03dHv3zERm1ZR3EwQY/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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