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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6a6180828e9230dc457d5c241d7acf4433c3ee2ad1438a73fd2dd48b903f53' 
  AND token = 'P7DHr5a5XZxPr6RaQC3nrPhF6W4QhCtiwViV4DStOwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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