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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e6351440e3ea7524dcf42cf10473dba39beea90894722528d491b7e96b18b5' 
  AND token = 'dt7e13c9ZtWp5cbLIQS+UTUYjUPlO9ACrvJ+fRVtxAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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