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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b718a84f22fb3d58116b89982a4ea089814dd462a96df556523f1f6bff7bacef' 
  AND token = '2SO2AEfLU3IQQ4EdBvjvk/Dzd9MxEI7hdgMH0Ibup+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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