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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c95f2e7f3366c1d47bc7ddcc855dc1499a3c8ae8adbea50e08c83b8556a9c4c' 
  AND token = 'MWl0doaV8bSFnGVMJZkLpEHTySMYfCWdjJGScNvjDMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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