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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84807ba258a8b23ab8aae8699d66a010d2a293cf8b9e7bc8b6f67ea525fffdf8' 
  AND token = '5KA+029pV6XX2L5x/bg2OGZz+ZtZswgwbqCh5sI/Xro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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